Catalyst for purifying exhaust gases

Details Catalyst for purifying exhaust gases Catalyst for purifying exhaust gases

1996-03-14

1999-09-07

Yildirim, Bekir L.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Mixture is exhaust from internal-combustion engine

4232132, 4232391, 502304, 502326, 502330, B01J 2363, B01J 2358

Patent

active

059483768

ABSTRACT:
A catalyst for purifying exhaust gases includes a porous support, an NO.sub.x storage component including at least one member selected from the group consisting of alkaline-earth metals, rare-earth elements and alkali metals, and loaded on the porous support, a noble metal catalyst ingredient loaded on the porous support, and disposed adjacent to the NO.sub.x storage component, and ceria (CeO.sub.2) disposed away from the noble metal catalyst ingredient. By disposing the noble metal catalyst ingredient adjacent to the NO.sub.x storage component, the reduction reactions of NO.sub.x can be facilitated in fuel-rich (i.e., oxygen-lean) atmospheres without being interfered by the ceria. By disposing the ceria away from the noble metal catalyst ingredient, oxygen, which has been stored thereon in fuel-lean (i.e., oxygen-rich) atmospheres, can be released from the ceria at a controlled rate in a controlled amount in fuel-rich (i.e., oxygen-lean) atmospheres, and thereby the released oxygen can be inhibited from reacting with HC and CO in fuel-rich (i.e., oxygen-lean) atmospheres. Thus, the catalyst is improved in terms of NO.sub.x purifying performance.

REFERENCES:
patent: 4369132 (1983-01-01), Kinoshita et al.
patent: 4426365 (1984-01-01), Magder
patent: 4678770 (1987-07-01), Wan et al.
patent: 4931419 (1990-06-01), Blanchard et al.
patent: 5388406 (1995-02-01), Takeshima et al.

Affiliated with

Also associated with

Rating

Catalyst for purifying exhaust gases does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Catalyst for purifying exhaust gases, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Catalyst for purifying exhaust gases will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1801899